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Mikhail Novikov,Kwai Lin Thong,Nur Izzurianna Mohd Zazali,Sharifah Bee Abd Hamid 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3
The efficacy of antimicrobial treatment of cotton fabrics depends on various parameters of the coating process, such as the chemical nature and concentration of the antimicrobial agent, the composition of the crosslinking formulation, and the curing temperature. The inclusion complex of triclosan with β-cyclodextrin (βCD) was synthesized and characterized by FTIR, XRD, NMR, Raman, SEM, and TGA. The minimum inhibitory concentration and minimum bactericidal concentration of the complex against Klebsiella pneumoniae and Staphylococcus aureus were compared to those of its precursor. A multifactorial study included an evaluation of the effects of triclosan complexation with β-cyclodextrin, a comparison between the glyoxal and tetracarboxylic acid as crosslinkers, an investigation of the effect of crosslinker and catalyst concentrations, and a comparison of curing at 120 oC and 180 oC. The cotton was characterized by FTIR-ATR, the micrographs of treated samples were obtained by SEM and the weight add-on was calculated. The bactericidal properties were determined according to AATCC-147. The correlation between the coating process parameters and the antimicrobial efficacy was determined. The optimal combination leading to the highest weight add-on and the antimicrobial coating that was most durable to multiple detergent washes at an elevated temperature was the use of complexed triclosan grafted onto the cotton in the presence of tetracarboxylic acid, followed by curing at 180 oC. The curing temperatures were 120 oC (P=0.002) and 180 oC (P=0.008), catalysts were 1 % and 2 % aluminium sulfate and sodium hypophosphite (P<0.001), and the crosslinkers were 5 % and 10 % glyoxal and butanetetracarboxylic acid (P<0.001); these parameters significantly enhanced the antimicrobial properties of the treated fabrics. The study showed that βCD did not have antimicrobial activity, while the βCD/ triclosan-treated textile exhibited potential antimicrobial properties. Overall, the bactericidal activity of fabrics can be enhanced by using βCD/triclosan with 10 % butanetetracarboxylic acid as a cross-linker and 5 % sodium hypophosphite as a catalyst at a curing temperature of 180 oC.
In-Use Compliance Emission Testing Analysis Applied in LabVIEW for Engineers
Mikhail, Ghaly-Rezk,Lee, Chun-Beom,Choi, Seong-Joo Korean Institute for Pratical Engineering Educatio 2014 실천공학교육논문지 Vol.6 No.2
Analyzing test data of a vehicle for evaluating its emission performance is an essential process in automotive development field, yet it is intricate and tedious task. In addition, clear understanding and care are required when the analysis process is carried out. Computer software solutions significantly reduce the time and the effort for such analysis. Developing a computer routine to analyze the emission data in a vehicle test demands a complete understanding of the emissions analysis and its related details. In this paper, the principals to develop a LabVIEW analysis routine (VI) are introduced helping automotive engineers comprehend the emission analysis process of a vehicle test data and instruct them to develop similar routines for such analysis.
Causality between sovereign, quasi-sovereign credit risks and global volatility: The case of Russia
Mikhail Stolbov 한양대학교 아태지역연구센터 2016 Journal of Eurasian Studies Vol.7 No.1
The article examines causalities between sovereign, most important quasi-sovereign CDS prices (Gazprom, VTB, Sberbank) for Russia and the global volatility factor embedded in the VIX index dynamics. The analysis refers to the post-bailout period in this major emerging economy (May 2009–July 2013). The causalities are assessed in the time (the Hong test) and frequency (the Breitung–Candelon test) domains. The VIX index dynamics has a strong impact on all Russian CDS, but also receives a non-negligible feedback from them. The sovereign and quasi-sovereign CDS prices exhibit a strong causal connectedness in both domains, with the impact of the quasi-sovereigns (in particular, that of banks) getting more pronounced in the longer run, i.e. over longer time horizons and at lower frequencies. High foreign exposure of the quasi-sovereigns, explicit/implicit public guarantees and the holdings of the Russian sovereign debt on their balances underlie the causalities. Given the systemic role that the government-controlled entities play in the Russian economy, this may lead to the “too big to save” effect with negative implications for financial and fiscal stability.
Mikhail D. Young,김경훈,오명규,권미라 한국작물학회 2018 Journal of crop science and biotechnology Vol.21 No.2
Korea mainly imports wheat because a relatively little amount (<1.0% of total usage) is produced domestically. Quality variation in domestic wheats is a major challenge for expanding domestic wheat production and end-use applications. Flour is mainly consumed for noodle making in Korea. Baegjoong is one of the most prevalent domestic wheat cultivars. To reduce quality variation of Baegjoong, a baseline data on the current status of Baegjoong quality is required. Therefore, the effect of growing a single cultivar of Korean domestic wheat, Baegjoong grown in different areas on flour quality was explored, mainly focusing on protein properties, which are known more sensitively influenced by growing environments as well as affecting noodle quality. Twenty Baegjoong flour samples milled from wheat grown in Gwangju, Naju, and Chilgok were subjected to proximate analysis, sedimentation volume, glutenin macropolymer, solvent retention capacity (SRC), and mixograph. Flour sample quality variations within each growing region and among growing regions were compared. Protein content, sedimentation volume, SRC value, and mixograph mid-line peak time, value, and width of flour samples showed significant variation among growing regions but much larger variation within growing regions. Although Gwangju and Naju are close, notable flour quality variations existed between the two city groups. Overall, variations in flour quality were larger. within regions, compared to those between regions, possibly due to different farming practices. To identify the main cause of quality variations within growing regions and reduce them, a survey of farming practices needs to be conducted.
An Introduction to the Edumatrix Set and Its Didactic Capabilities
( Mikhail Semenov ),( Yong S. Colen ),( Jung Colen ),( Antony Pardala ) 한국수학교육학회 2020 수학교육연구 Vol.23 No.1
Learning through “recreational mathematics” has become a meaningful outlet to children of all ages. The Edumatrix set is a didactic tool for the development of logical and abstract reasoning among students. In this paper, we provide several illustrative exercises involving Edumatrix that teachers can utilize in their classrooms. We formulate students’ expected learning outcomes by aligning each exercise to the CCSSM content standards as well as examining which Standards for Mathematical Practices (SMP) our proposed exercises promote.